Piston ring expander



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UNITED STATES PATENT OFFICE PISTON RING EXPANDER. Maynard G. Carlisle, Manchester Center, Vt.

7 Application April 10, 1937, Serial No. 136,233

- 3 Claims. (Cl. 309-43) The object of the invention is to provide a protuberance which protrudes into the space bedevice for use in connection with the piston tween the ends of the piston ring I3, so that there rings of internal combustion engines to not only can be no relative angular or turning movement expand the ring into firm contact with the cylinbetween the expander ring and the piston ring.

5 der wall but likewise to preclude leakage around In use, the preferable manner of mounting is 5 the piston ring groove; to provide a piston ring with the flange II on the lower edge of the piston expander which, when mounted, will not change ring groove and this flange is kept in firm conits position relative to the ring, so that the splits tact with the bottom wall of the groove by the in the expander and ring may be precluded from arched portions of the tongues l5, the slots l6 registering. and thereby permit leakage; and to providing for slight compression of the, expander 0 provide a device of the kindindicated which is of ring in the direction of its width. These slots simple form and therefore susceptible of cheap also serve as oil passages when the inner ring manufacture. is used inside of regular oil rings but in case of With this object in view, the invention consuch use, the expanderring is preferably posi- 5 sists in a construction and combination of parts tioned with the flange l0 against the upper face of which apreferred embodiment is illustrated in of the piston ring groove. The holes or perthe accompanying drawing, wherein: forations l1 function as vents.

Figure 1 is a cross sectional view of a piston The invention having been described, what is in the. plane of the upper edge of the groove, claimed as new and useful is: showing the ring and the expander of the in- .1. A devi e for the purp se indic t d c mprls- 20 vention in top plan. ing a ring member formed with an inturned Figure 2 is a sectional view on the plane indin a fl ge at One e e d tongues at the cated by the line 2-2 of Figure 1. opposite edge bent over and down against the Figure 3 is aperspective view illustrating the back face of the ring member and terminating expander. in presser springs, the tongues at the bent over The expander is in the form of an annular po ons extending above the edge of t e ring member made of sheet metal turned angularly member for ta it a fi face of 8' P st n at one of its longitudinal edges before being ring groove to force the flange into contact with bent into annular or ring form, so that there is the other fiat face of said groove, t ring provided a split ring In with an inturned annular her being formed with circumferential slots diflange II. In the use of the device, preferably rectly in front of the presser springs.

this flange is at the lower edge of the piston 2. A device for the purpose indicated comprisrlng groove I2, as indicated in Figure 2, although ing a ring member formed with an inturned the device may be used in inverted position unannular flange at one edge and tongues at the der certain conditions. As an expander, the opposite edge bent over and down against the 35 not relied p to p d 0 radially back face of the ring member andterminating p d the P t ring but is Provided With, in presser springs, the tongues at the bent over pr ss r sprin s l ea of which is generallyg, portions extending above the edge of the ring arcuate With e peak of the a bearing in -member for contact with a flat face of a piston 40 the bottom of the p on ring roove a the ring groove to force the flange into contact with 40 extremitles the legs bearing against the back the other fiat face of said groove the ring memface ofthe ring Ill. The presser springs are arher being fonned t circumferential slots 1- ranged in Pairs and are fmfmed as integr all t rectly in front of the presser springs, the presser of the tongues 1 h tOngueS being integral springs being arranged in pairs with the units of each pair on opposite sides of but integrally 95 connected with the tongues.

3. A device for the purpose indicated comprls-j ing a ring member formed with an inturned annular flange at one edge and tongues at the m T 1 er an d n The presser spring units each consists of a gfi fi if fi gg fi l manger 23 f i i fig tgg pair of presser springs and its connected tongue in presser springs, the ring member being formed and there are a plurality of such units distributed with circumferential 1 t directly in m; of ar the body P n f h ring 0n the the presser springs, the presser springs being ear ac o ut the in isslotted. as far-ranged in pairs with the units of each pair on 55 indicated at iii, in the region of e h unit and opposite sides of but integrally connected with the tongue of each is formed with an-opening th t n es, and the latter havin 'vent 0 l1 directly behind the slot I t r 8 pemngs The body ,portion of the ring is upset, as i indicated at Hi, to provide a projecting bulge or MAYNARD G. CARLI edge of the latter and being bent over and downwardly to lie against the'rear face of the ring. The springs besides being suspended from the tongues are spot welded to the ring, as indicated 

